Composition of Natural Asphalt 

Water and Gas, Volatilised at 100⁰C

29.0%

Bitumen Soluble in cold carbon disulphide

39.0%

Bitumen Absorbed by mineral matter

.3%

Mineral Matter, on ignition with tricalcium – phosphate

27.2%

Water of hydration of clay

4.3%

99.8%